Ah... just discovered an issue with my approach. When sectioning walls, the left/right option for the complex line types does not work.... or at least it only works for any single direction of a wall.  When sectioning the opposing direction, it renders the complex line geometry on the wrong side of the line. One work around is to duplicate the wall styles so there is a left/right style and a right left/style... but this is not great. frustrating, as if there was a centre line options, this issue